Merge branch 'v4.17-rc1'

Documentation/devicetree/bindings/watchdog/nuvoton,npcm-wdt.txt

+Nuvoton NPCM Watchdog
+
+Nuvoton NPCM timer module provides five 24-bit timer counters, and a watchdog.
+The watchdog supports a pre-timeout interrupt that fires 10ms before the
+expiry.
+
+Required properties:
+- compatible      : "nuvoton,npcm750-wdt" for NPCM750 (Poleg).
+- reg             : Offset and length of the register set for the device.
+- interrupts      : Contain the timer interrupt with flags for
+                    falling edge.
+
+Required clocking property, have to be one of:
+- clocks          : phandle of timer reference clock.
+- clock-frequency : The frequency in Hz of the clock that drives the NPCM7xx
+                    timer (usually 25000000).
+
+Optional properties:
+- timeout-sec : Contains the watchdog timeout in seconds
+
+Example:
+
+timer@f000801c {
+    compatible = "nuvoton,npcm750-wdt";
+    interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
+    reg = <0xf000801c 0x4>;
+    clocks = <&clk NPCM7XX_CLK_TIMER>;
+};

drivers/watchdog/Kconfig

@@ -514,6 +514,17 @@ config COH901327_WATCHDOG
 	  This watchdog is used to reset the system and thus cannot be
 	  compiled as a module.
 
+config NPCM7XX_WATCHDOG
+	bool "Nuvoton NPCM750 watchdog"
+	depends on ARCH_NPCM || COMPILE_TEST
+	default y if ARCH_NPCM750
+	select WATCHDOG_CORE
+	help
+	  Say Y here to include Watchdog timer support for the
+	  watchdog embedded into the NPCM7xx.
+	  This watchdog is used to reset the system and thus cannot be
+	  compiled as a module.
+
 config TWL4030_WATCHDOG
 	tristate "TWL4030 Watchdog"
 	depends on TWL4030_CORE

drivers/watchdog/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
 obj-$(CONFIG_SUNXI_WATCHDOG) += sunxi_wdt.o
 obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
 obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
+obj-$(CONFIG_NPCM7XX_WATCHDOG) += npcm_wdt.o
 obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
 obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
 obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o

drivers/watchdog/ar7_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * drivers/watchdog/ar7_wdt.c
  *
@@ -8,19 +9,6 @@
  * National Semiconductor SCx200 Watchdog support
  * Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/aspeed_wdt.c

@@ -46,6 +46,7 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
 #define WDT_RELOAD_VALUE	0x04
 #define WDT_RESTART		0x08
 #define WDT_CTRL		0x0C
+#define   WDT_CTRL_BOOT_SECONDARY	BIT(7)
 #define   WDT_CTRL_RESET_MODE_SOC	(0x00 << 5)
 #define   WDT_CTRL_RESET_MODE_FULL_CHIP	(0x01 << 5)
 #define   WDT_CTRL_RESET_MODE_ARM_CPU	(0x10 << 5)
@@ -158,6 +159,7 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd,
 {
 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
 
+	wdt->ctrl &= ~WDT_CTRL_BOOT_SECONDARY;
 	aspeed_wdt_enable(wdt, 128 * WDT_RATE_1MHZ / 1000);
 
 	mdelay(1000);
@@ -245,6 +247,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 	}
 	if (of_property_read_bool(np, "aspeed,external-signal"))
 		wdt->ctrl |= WDT_CTRL_WDT_EXT;
+	if (of_property_read_bool(np, "aspeed,alt-boot"))
+		wdt->ctrl |= WDT_CTRL_BOOT_SECONDARY;
 
 	if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE)  {
 		/*

drivers/watchdog/at91rm9200_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for Atmel AT91RM9200 (Thunder)
  *
  *  Copyright (C) 2003 SAN People (Pty) Ltd
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/at91sam9_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for Atmel AT91SAM9x processors.
  *
  * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
 /*

drivers/watchdog/at91sam9_wdt.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * drivers/watchdog/at91sam9_wdt.h
  *
@@ -7,10 +8,6 @@
  * Watchdog Timer (WDT) - System peripherals regsters.
  * Based on AT91SAM9261 datasheet revision D.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #ifndef AT91_WDT_H

drivers/watchdog/bcm2835_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for Broadcom BCM2835
  *
@@ -7,10 +8,6 @@
  *
  * Copyright (C) 2013 Lubomir Rintel <lkundrak@v3.sk>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
  */
 
 #include <linux/delay.h>

drivers/watchdog/bcm47xx_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  Watchdog driver for Broadcom BCM47XX
  *
@@ -5,10 +6,6 @@
  *  Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
  *  Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de>
  *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version
- *  2 of the License, or (at your option) any later version.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/bcm63xx_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  Broadcom BCM63xx SoC watchdog driver
  *
  *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
  *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
  *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version
- *  2 of the License, or (at your option) any later version.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/watchdog/bcm7038_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2015 Broadcom Corporation
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/clk.h>
@@ -235,6 +227,6 @@ module_platform_driver(bcm7038_wdt_driver);
 module_param(nowayout, bool, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Driver for Broadcom 7038 SoCs Watchdog");
 MODULE_AUTHOR("Justin Chen");

drivers/watchdog/bcm_kona_wdt.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2013 Broadcom Corporation
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/debugfs.h>

drivers/watchdog/cadence_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Cadence WDT driver - Used by Xilinx Zynq
  *
  * Copyright (C) 2010 - 2014 Xilinx, Inc.
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
 #include <linux/clk.h>

drivers/watchdog/da9052_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * System monitoring driver for DA9052 PMICs.
  *
@@ -5,11 +6,6 @@
  *
  * Author: Anthony Olech <Anthony.Olech@diasemi.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
  */
 
 #include <linux/module.h>

drivers/watchdog/da9055_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * System monitoring driver for DA9055 PMICs.
  *
@@ -5,11 +6,6 @@
  *
  * Author: David Dajun Chen <dchen@diasemi.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
  */
 
 #include <linux/module.h>

drivers/watchdog/da9062_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog device driver for DA9062 and DA9061 PMICs
  * Copyright (C) 2015  Dialog Semiconductor Ltd.
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/kernel.h>

drivers/watchdog/da9063_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for DA9063 PMICs.
  *
@@ -5,10 +6,6 @@
  *
  * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
  *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
  */
 
 #include <linux/kernel.h>

drivers/watchdog/digicolor_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for Conexant Digicolor
  *
  * Copyright (C) 2015 Paradox Innovation Ltd.
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
  */
 
 #include <linux/types.h>

drivers/watchdog/ebc-c384_wdt.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Watchdog timer driver for the WinSystems EBC-C384
  * Copyright (C) 2016 William Breathitt Gray

drivers/watchdog/mei_wdt.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel Management Engine Interface (Intel MEI) Linux driver
  * Copyright (c) 2015, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
  */
 
 #include <linux/module.h>
@@ -687,5 +679,5 @@ static struct mei_cl_driver mei_wdt_driver = {
 module_mei_cl_driver(mei_wdt_driver);
 
 MODULE_AUTHOR("Intel Corporation");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Device driver for Intel MEI iAMT watchdog");

drivers/watchdog/mena21_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for the A21 VME CPU Boards
  *
  * Copyright (C) 2013 MEN Mikro Elektronik Nuernberg GmbH
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation
  */
 #include <linux/module.h>
 #include <linux/moduleparam.h>

drivers/watchdog/meson_gxbb_wdt.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * This file is provided under a dual BSD/GPLv2 license.  When using or
- * redistributing this file, you may do so under either license.
- *
- * GPL LICENSE SUMMARY
- *
  * Copyright (c) 2016 BayLibre, SAS.
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- * The full GNU General Public License is included in this distribution
- * in the file called COPYING.
- *
- * BSD LICENSE
- *
- * Copyright (c) 2016 BayLibre, SAS.
- * Author: Neil Armstrong <narmstrong@baylibre.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- *   * Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in
- *     the documentation and/or other materials provided with the
- *     distribution.
- *   * Neither the name of Intel Corporation nor the names of its
- *     contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <linux/clk.h>
 #include <linux/err.h>

drivers/watchdog/mtk_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Mediatek Watchdog Driver
  *
@@ -5,16 +6,6 @@
  *
  * Matthias Brugger <matthias.bgg@gmail.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  * Based on sunxi_wdt.c
  */
 

drivers/watchdog/mtx-1_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  *      Driver for the MTX-1 Watchdog.
  *
@@ -6,16 +7,6 @@
  *                              http://www.4g-systems.biz
  *
  *	(C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
- *
- *      Neither Michael Stickel nor 4G Systems admit liability nor provide
- *      warranty for any of this software. This material is provided
- *      "AS-IS" and at no charge.
- *
  *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
  *
  *      Release 0.01.

drivers/watchdog/npcm_wdt.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Nuvoton Technology corporation.
+// Copyright (c) 2018 IBM Corp.
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/watchdog.h>
+
+#define NPCM_WTCR	0x1C
+
+#define NPCM_WTCLK	(BIT(10) | BIT(11))	/* Clock divider */
+#define NPCM_WTE	BIT(7)			/* Enable */
+#define NPCM_WTIE	BIT(6)			/* Enable irq */
+#define NPCM_WTIS	(BIT(4) | BIT(5))	/* Interval selection */
+#define NPCM_WTIF	BIT(3)			/* Interrupt flag*/
+#define NPCM_WTRF	BIT(2)			/* Reset flag */
+#define NPCM_WTRE	BIT(1)			/* Reset enable */
+#define NPCM_WTR	BIT(0)			/* Reset counter */
+
+/*
+ * Watchdog timeouts
+ *
+ * 170     msec:    WTCLK=01 WTIS=00     VAL= 0x400
+ * 670     msec:    WTCLK=01 WTIS=01     VAL= 0x410
+ * 1360    msec:    WTCLK=10 WTIS=00     VAL= 0x800
+ * 2700    msec:    WTCLK=01 WTIS=10     VAL= 0x420
+ * 5360    msec:    WTCLK=10 WTIS=01     VAL= 0x810
+ * 10700   msec:    WTCLK=01 WTIS=11     VAL= 0x430
+ * 21600   msec:    WTCLK=10 WTIS=10     VAL= 0x820
+ * 43000   msec:    WTCLK=11 WTIS=00     VAL= 0xC00
+ * 85600   msec:    WTCLK=10 WTIS=11     VAL= 0x830
+ * 172000  msec:    WTCLK=11 WTIS=01     VAL= 0xC10
+ * 687000  msec:    WTCLK=11 WTIS=10     VAL= 0xC20
+ * 2750000 msec:    WTCLK=11 WTIS=11     VAL= 0xC30
+ */
+
+struct npcm_wdt {
+	struct watchdog_device  wdd;
+	void __iomem		*reg;
+};
+
+static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd)
+{
+	return container_of(wdd, struct npcm_wdt, wdd);
+}
+
+static int npcm_wdt_ping(struct watchdog_device *wdd)
+{
+	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
+	u32 val;
+
+	val = readl(wdt->reg);
+	writel(val | NPCM_WTR, wdt->reg);
+
+	return 0;
+}
+
+static int npcm_wdt_start(struct watchdog_device *wdd)
+{
+	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
+	u32 val;
+
+	if (wdd->timeout < 2)
+		val = 0x800;
+	else if (wdd->timeout < 3)
+		val = 0x420;
+	else if (wdd->timeout < 6)
+		val = 0x810;
+	else if (wdd->timeout < 11)
+		val = 0x430;
+	else if (wdd->timeout < 22)
+		val = 0x820;
+	else if (wdd->timeout < 44)
+		val = 0xC00;
+	else if (wdd->timeout < 87)
+		val = 0x830;
+	else if (wdd->timeout < 173)
+		val = 0xC10;
+	else if (wdd->timeout < 688)
+		val = 0xC20;
+	else
+		val = 0xC30;
+
+	val |= NPCM_WTRE | NPCM_WTE | NPCM_WTR | NPCM_WTIE;
+
+	writel(val, wdt->reg);
+
+	return 0;
+}
+
+static int npcm_wdt_stop(struct watchdog_device *wdd)
+{
+	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
+
+	writel(0, wdt->reg);
+
+	return 0;
+}
+
+
+static int npcm_wdt_set_timeout(struct watchdog_device *wdd,
+				unsigned int timeout)
+{
+	if (timeout < 2)
+		wdd->timeout = 1;
+	else if (timeout < 3)
+	      wdd->timeout = 2;
+	else if (timeout < 6)
+	      wdd->timeout = 5;
+	else if (timeout < 11)
+	      wdd->timeout = 10;
+	else if (timeout < 22)
+	      wdd->timeout = 21;
+	else if (timeout < 44)
+	      wdd->timeout = 43;
+	else if (timeout < 87)
+	      wdd->timeout = 86;
+	else if (timeout < 173)
+	      wdd->timeout = 172;
+	else if (timeout < 688)
+	      wdd->timeout = 687;
+	else
+	      wdd->timeout = 2750;
+
+	if (watchdog_active(wdd))
+		npcm_wdt_start(wdd);
+
+	return 0;
+}
+
+static irqreturn_t npcm_wdt_interrupt(int irq, void *data)
+{
+	struct npcm_wdt *wdt = data;
+
+	watchdog_notify_pretimeout(&wdt->wdd);
+
+	return IRQ_HANDLED;
+}
+
+static int npcm_wdt_restart(struct watchdog_device *wdd,
+			    unsigned long action, void *data)
+{
+	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
+
+	writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, wdt->reg);
+	udelay(1000);
+
+	return 0;
+}
+
+static bool npcm_is_running(struct watchdog_device *wdd)
+{
+	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
+
+	return readl(wdt->reg) & NPCM_WTE;
+}
+
+static const struct watchdog_info npcm_wdt_info = {
+	.identity	= KBUILD_MODNAME,
+	.options	= WDIOF_SETTIMEOUT
+			| WDIOF_KEEPALIVEPING
+			| WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops npcm_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = npcm_wdt_start,
+	.stop = npcm_wdt_stop,
+	.ping = npcm_wdt_ping,
+	.set_timeout = npcm_wdt_set_timeout,
+	.restart = npcm_wdt_restart,
+};
+
+static int npcm_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct npcm_wdt *wdt;
+	struct resource *res;
+	int irq;
+	int ret;
+
+	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	wdt->reg = devm_ioremap_resource(dev, res);
+	if (IS_ERR(wdt->reg))
+		return PTR_ERR(wdt->reg);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	wdt->wdd.info = &npcm_wdt_info;
+	wdt->wdd.ops = &npcm_wdt_ops;
+	wdt->wdd.min_timeout = 1;
+	wdt->wdd.max_timeout = 2750;
+	wdt->wdd.parent = dev;
+
+	wdt->wdd.timeout = 86;
+	watchdog_init_timeout(&wdt->wdd, 0, dev);
+
+	/* Ensure timeout is able to be represented by the hardware */
+	npcm_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);
+
+	if (npcm_is_running(&wdt->wdd)) {
+		/* Restart with the default or device-tree specified timeout */
+		npcm_wdt_start(&wdt->wdd);
+		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
+	}
+
+	ret = devm_request_irq(dev, irq, npcm_wdt_interrupt, 0,
+			       "watchdog", wdt);
+	if (ret)
+		return ret;
+
+	ret = devm_watchdog_register_device(dev, &wdt->wdd);
+	if (ret) {
+		dev_err(dev, "failed to register watchdog\n");
+		return ret;
+	}
+
+	dev_info(dev, "NPCM watchdog driver enabled\n");
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id npcm_wdt_match[] = {
+	{.compatible = "nuvoton,npcm750-wdt"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, npcm_wdt_match);
+#endif
+
+static struct platform_driver npcm_wdt_driver = {
+	.probe		= npcm_wdt_probe,
+	.driver		= {
+		.name	= "npcm-wdt",
+		.of_match_table = of_match_ptr(npcm_wdt_match),
+	},
+};
+module_platform_driver(npcm_wdt_driver);
+
+MODULE_AUTHOR("Joel Stanley");
+MODULE_DESCRIPTION("Watchdog driver for NPCM");
+MODULE_LICENSE("GPL v2");

drivers/watchdog/of_xilinx_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog Device Driver for Xilinx axi/xps_timebase_wdt
  *
  * (C) Copyright 2013 - 2014 Xilinx, Inc.
  * (C) Copyright 2011 (Alejandro Cabrera <aldaya@gmail.com>)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
 #include <linux/clk.h>
@@ -323,4 +319,4 @@ module_platform_driver(xwdt_driver);
 
 MODULE_AUTHOR("Alejandro Cabrera <aldaya@gmail.com>");
 MODULE_DESCRIPTION("Xilinx Watchdog driver");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");

drivers/watchdog/st_lpc_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * ST's LPC Watchdog
  *
@@ -5,11 +6,6 @@
  *
  * Author: David Paris <david.paris@st.com> for STMicroelectronics
  *         Lee Jones <lee.jones@linaro.org> for STMicroelectronics
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
  */
 
 #include <linux/clk.h>

drivers/watchdog/tangox_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
  *  SMP86xx/SMP87xx Watchdog driver
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under  the terms of the GNU General  Public License as published by the
- *  Free Software Foundation;  either version 2 of the License, or (at your
- *  option) any later version.
  */
 
 #include <linux/bitops.h>

drivers/watchdog/tegra_wdt.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #include <linux/kernel.h>

drivers/watchdog/uniphier_wdt.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Watchdog driver for the UniPhier watchdog timer
  *
  * (c) Copyright 2014 Panasonic Corporation
  * (c) Copyright 2016 Socionext Inc.
  * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/bitops.h>

drivers/watchdog/wm831x_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for the wm831x PMICs
  *
  * Copyright (C) 2009 Wolfson Microelectronics
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation
  */
 
 #include <linux/module.h>

drivers/watchdog/wm8350_wdt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Watchdog driver for the wm8350
  *
  * Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt